feat(website): footer sub-pages + shared page layout

Wire every footer link to a real route. Adds a shared `page` layout (Nav +
content + Footer), reusable PageHeader/ComingSoon components, six content pages
(about, contact, brand, roadmap, changelog, migration), and a dynamic [slug]
catch-all for the not-yet-built pages — unknown slugs 404, legal slugs get a
distinct "contact us" body.

Footer links repointed from dead "#" to real paths; section anchors ("/#suite")
smooth-scroll on the homepage and route home + scroll from a sub-page; logo
links home. Page copy (da + en) added under COPY.pages.

apps/website/pages/migration.vue

@@ -0,0 +1,34 @@
+<script setup lang="ts">
+import { useRoute } from 'vue-router'
+import { useTheme, useCopy, goToSection } from '~/composables/useLanding'
+
+definePageMeta({ layout: 'page' })
+
+const t = useTheme()
+const copy = useCopy()
+const route = useRoute()
+const c = computed(() => copy.value.pages.migration)
+
+useHead({ title: () => `${copy.value.pages.migration.label} · dezky` })
+</script>
+
+<template>
+  <LandingPageHeader :label="c.label" :title="c.title" :intro="c.intro" />
+
+  <LandingContainer pad="56px 64px 80px">
+    <div :style="{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '40px' }">
+      <div v-for="(step, i) in c.steps" :key="i">
+        <div :style="{ paddingTop: '20px', borderTop: `1px solid ${t.borderStrong}` }">
+          <div :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '12px', color: t.fgDim, letterSpacing: '0.06em' }">step {{ step[0] }}</div>
+          <div :style="{ marginTop: '20px', fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '24px', color: t.fg, letterSpacing: '-0.02em' }">{{ step[1] }}</div>
+          <p :style="{ marginTop: '12px', fontFamily: '\'Inter\', sans-serif', fontSize: '15px', lineHeight: 1.6, color: t.fgMuted, textWrap: 'pretty' }">{{ step[2] }}</p>
+        </div>
+      </div>
+    </div>
+
+    <p :style="{ marginTop: '64px', fontFamily: '\'Inter\', sans-serif', fontSize: '16px', color: t.fg }">{{ c.note }}</p>
+    <div :style="{ marginTop: '32px' }">
+      <LandingBtn variant="primary" size="lg" @click="goToSection('#final-cta', route.path)">{{ copy.pages.ctaDemo }} →</LandingBtn>
+    </div>
+  </LandingContainer>
+</template>